{[Cu(bipy)2.5(H2O)](ClO4)2 · (H2O) · (CH3OH)1.5}n (bipy = 4,4′-bipyridine): organic template effect in formation of a novel bilayer coordination polymer with large chiral channels

In the presence of the organic template molecule, 4-amino-3,5-bis(4-pyridyl)-1,2,4-triazole, a unique acentric coordination polymer based on linear 4,4′-bipyridine (bipy) bridging ligand, {[Cu(bipy)2.5(H2O)](ClO4)2 · (H2O) · (CH3OH)1.5}n (1), was obtained by the reaction of Cu(II) perchlorate with bipy in H2O/CH3OH medium. The bidendate bipy molecules bridge the CuII centers to form a 2-D bilayer framework with an 82 · 10 topology, and the monodendate bipy ligands, locating up and down each 2-D architecture, are involved in significant aromatic stacking interactions with the adjacent 2-D motifs, resulting in a 3-D porous network with large square channels for including the guest solvents and anions.